\documentclass[letterpaper]{article}
\usepackage{pstricks}
\usepackage{pst-plot}
\definecolor{lightblue}{rgb}{0.9,0.9,1}
%
\begin{document}

\begin{pspicture}(-1.5,-2.5)(10.5,2.5)
  % draw an airfoil
    \pscurve[linewidth=0.5pt,linecolor=blue,fillstyle=solid,fillcolor=lightblue]%
      (0,0)(0.82,0.1)(2.8,0.345)(5.37,0.55)(7.84,0.582)(8.75,0.507)(9.43,0.36)(9.98,0.1)(10,0)
      (9.98,-0.1)(9.43,-0.36)(8.75,-0.507)(7.84,-0.582)(5.37,-0.55)(2.8,-0.345)(0.82,-0.1)(0,0)
  \psline[linewidth=1pt, linecolor=black](0.0,0.0)(10.0,0.0)
  \psaxes[linewidth=1pt, labels=none, ticks=none]{->}(5,0)(5,0)(-1,2)
 % L'
  \psline[linewidth=1pt, linecolor=red]{->}(7.5,0.0)(7.5,2.0)
  % Weight
  \psline[linewidth=1pt, linecolor=red]{->}(5.0,0.0)(5.0,-2.0)
  % M'ac
  \psarc[linewidth=1pt, linecolor=red]{->>}(7.5,0){0.5cm}{-220}{40}
  % e
  \psline[linewidth=1pt, linecolor=black]{<->}(5.0,1.0)(7.5,1.0)
  % x_ac
  \psline[linewidth=1pt, linecolor=black]{<->}(7.5,1.0)(10.0,1.0)
  % put c.g. point
  \qdisk(5,0){4pt}
  % put a.c. point
  \qdisk(7.5,0){4pt}
  \uput[u](6.125,1.0){$e$}
  \psgrid[gridcolor=lightgray, gridwidth=0.5pt, subgriddiv=1, gridlabels=7pt](0,0)(0,-2.0)(10.0,2.0)
\end{pspicture}

\end{document}
